I'm in North Texas. Ventilation being important, I have the ability to close the north side front door of my coop, cover my hardware cloth windows on north, west and sometimes east side, leave them open on south side. I cover the north side of the run with plastic, a shed protects the west side, and the west side coop entrance is open so they can get in and out, I open coop door to carry water if it is too cold, several times a day. Electricity tends to go out here when it is really cold so I've quit keeping pumps or other heating devices for water, does no good. I heat my house with a woodstove. so much for Ercot rolling blackouts